# The Milk (Special Designation) Regulations 1989, Paragraph 3


The plated sample shall—
(a) in the case of pasteurised milk produced from raw milk or from bulk milk heat treated for transportation, be incubated for 25 hours at 21°C.,
(b) in any other case, be incubated for 72 hours at 30°C.

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Source: https://www.legislation.gov.uk/uksi/1989/2383/schedule/5/part/III/paragraph/3 (the official version)
Page: https://openlegislation.uk/milk-special-designation-regulations-1989/schedule-5/part-III/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.